Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82635503cd11efd…

MALICIOUS

PDF

88.7 KB Created: 2021-02-23 01:06:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e93dfc067bf6d34c7233d84e11b5ff95 SHA-1: d5ab29baeeb9d32f381e137307e16c59c275d90a SHA-256: a82635503cd11efdbf892730dfe651761be9decabc604689a2243c1a52e67580
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spam operation. ClamAV and ML heuristics identify it as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/wix?keyword=lazor+wulf+vince+staples PDF link annotation
    • http://vetapako.22web.org/7822570016.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxodokoju/wkNEoia/fuxajivesexomowatinaj.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/BRjevPQ/ar_effect_apk_xda.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/hcFfibh/amc_24_movies_tonight.pdfIn PDF document text
    • https://bijigixeze.weebly.com/uploads/1/3/0/7/130739450/wonal-siriz-mowonogagi-bugamuxopaloku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499999/normal_5fdda59640b87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387241/normal_5fee86b8be227.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzudulo/jAzXfgg/quiz_rpg_boku_no_hero_academia.pdfIn PDF document text
    • https://cdn.sqhk.co/zufutetuwume/LWgcih3/lock_screen_timeout_windows_10_gpo.pdfIn PDF document text
    • https://giliwafe.weebly.com/uploads/1/3/4/0/134016831/lurofawageje-belatatemif-gawudo-jesuluminep.pdfIn PDF document text
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/lenubugonuz-samapitesebif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sapirilogive.epizy.com/70294167434.pdfIn PDF document text
    • http://tugepujato.rf.gd/scream_3_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/wrist_stretching_and_strengthening_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/forgotten_realms_dark_elf_names.pdfIn PDF document text
    • http://soburuwukipo.epizy.com/53856352212.pdfIn PDF document text
    • http://sosozodazu.epizy.com/josaximuvirovutapakuxekug.pdfIn PDF document text
    • http://wotawegij.rf.gd/how_to_cook_brown_rice_in_a_multi_cooker.pdfIn PDF document text
    • http://zadiriraki.epizy.com/vugitupawaruten.pdfIn PDF document text
    • http://segixof.epizy.com/best_free_android_games_that_support_controller.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/xugirazujexuz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 5152 bytes
SHA-256: be41c09a0260d7da68ce5c5dee47028ed087c9a7bc4be6238405dd9ccbe35763
font_01_sfnt_off00012ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF9 11068 bytes
SHA-256: 83c24b72d44995c1f9c2dc9f1b9b393d5fbb0edb78d25c26765b426d3dcf5f37

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